<template>
  <div>
    <div class="user-info-head" @click="editCropper()">
      <img v-bind:src="options.img" title="点击上传登录页背景图" class="img-circle img-lg" />
    </div>
    <el-dialog :title="title" :visible.sync="open" width="800px" append-to-body @opened="modalOpened"  @close="closeDialog">
      <el-row>
        <el-col :xs="24" :md="24" :style="{height: '350px'}">
          <vue-cropper
            ref="loginBgCropper"
            :img="options.img"
            :autoCrop="false"
            :canMove="false"
            :canScale="false"
            :canRotate="false"
            :disabled="true"
            :info="true"
            :original="true"
            :outputSize = "1"
            :outputType="options.outputType"
            @realTime="realTime"
            v-if="visible"
          />
        </el-col>
      </el-row>
      <br />
      <el-row>
        <el-col :lg="2" :sm="3" :xs="3">
          <el-upload action="#" :http-request="requestUpload" :show-file-list="false" :before-upload="beforeUpload">
            <el-button size="small">
              选择
              <i class="el-icon-upload el-icon--right"></i>
            </el-button>
          </el-upload>
        </el-col>
        <el-col :lg="{span: 16, offset: 2}" :sm="2" :xs="2" style="display: flex">
          <el-form label-width="150px">
            <el-form-item label="登录框位置">
              <el-radio-group v-model="loginBoxLocationTemp">
                <el-radio-button label="L">靠左</el-radio-button>
                <el-radio-button label="C">居中</el-radio-button>
                <el-radio-button label="R">居右</el-radio-button>
              </el-radio-group>
            </el-form-item>
          </el-form>
        </el-col>
        <el-col :lg="{span: 2, offset: 2}" :sm="2" :xs="2">
          <el-button type="primary" size="small" @click="uploadImg()">提 交</el-button>
        </el-col>
      </el-row>
    </el-dialog>
  </div>
</template>

<script>
import store from "@/store";
import { VueCropper } from "vue-cropper";
import { uploadLogo} from "@/api/system/user";
import { debounce } from '@/utils'
import request from "@/utils/request";

export default {
  components: { VueCropper },
  props:{
    loginBg:'',
    loginBoxLocation: {
      type: String,
      default: 'C'
    }
  },
  data() {
    return {
      // 是否显示弹出层
      open: false,
      // 是否显示cropper
      visible: false,
      loginBoxLocationTemp: 'C',
      // 弹出层标题
      title: "上传登录页背景图",
      options: {
        img: '',  //裁剪图片的地址
        autoCrop: false,             // 是否默认生成截图框
        fixedBox: true,             // 固定截图框大小 不允许改变
        outputType:"png",           // 默认生成截图为PNG格式
        filename: 'loginBg'          // 文件名称
      },
      previews: {},
      resizeHandler: null
    };
  },
  methods: {
    // 编辑头像
    editCropper() {
      this.open = true;
    },
    // 打开弹出层结束时的回调
    modalOpened() {
      this.visible = true;
      if (!this.resizeHandler) {
        this.resizeHandler = debounce(() => {
          this.refresh()
        }, 100)
      }
      window.addEventListener("resize", this.resizeHandler)
    },
    // 刷新组件
    refresh() {
      this.$refs.loginBgCropper.refresh();
    },
    // 覆盖默认的上传行为
    requestUpload() {
    },
    // 向左旋转
    rotateLeft() {
      this.$refs.loginBgCropper.rotateLeft();
    },
    // 向右旋转
    rotateRight() {
      this.$refs.loginBgCropper.rotateRight();
    },
    // 图片缩放
    changeScale(num) {
      num = num || 1;
      this.$refs.loginBgCropper.changeScale(num);
    },
    // 上传预处理
    beforeUpload(file) {
      if (file.type.indexOf("image/") == -1) {
        this.$modal.msgError("文件格式错误，请上传图片类型,如：JPG，PNG后缀的文件。");
      } else {
        const reader = new FileReader();
        reader.readAsDataURL(file);
        reader.onload = () => {
          this.options.img = reader.result;
          this.options.filename = file.name;
        };
      }
    },
    // 上传图片
    uploadImg() {
      this.$refs.loginBgCropper.getCropBlob(data => {
        let formData = new FormData();
        formData.append("loginBgFile", data, this.options.filename);
        formData.append("location", this.loginBoxLocationTemp);
        request({
          url: '/system/SysInfo/loginBg',
          method: 'post',
          data: formData
        }).then(response => {
          this.open = false;
          this.options.img = process.env.VUE_APP_BASE_API + response.loginBgUrl;
          store.commit('SET_Login_Bg', this.options.img);
          this.$modal.msgSuccess("修改成功");
          this.$emit("refreshLoginBg",response.logoUrl)
          this.visible = false;
        });
      });
    },
    // 实时预览
    realTime(data) {
      this.previews = data;
    },
    // 关闭窗口
    closeDialog() {
      if(store.getters.loginBg){
        this.options.img = store.getters.loginBg
      }
      this.visible = false;
      window.removeEventListener("resize", this.resizeHandler)
    }
  },
  watch:{
    'loginBg':{
      immediate:true,
      handler(val){
        const logo = this.isEmpty(val) ? require("@/assets/images/login-background.jpg") : process.env.VUE_APP_BASE_API + val;
        this.options.img = logo
      }
    },
    'loginBoxLocation':{
      immediate:true,
      handler(val){
        this.loginBoxLocationTemp = val
      }
    }
  }
};
</script>
<style scoped lang="scss">
.user-info-head {
  position: relative;
  display: inline-block;
  height: 120px;
}

.user-info-head:hover:after {
  content: '+';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  color: #eee;
  background: rgba(0, 0, 0, 0.5);
  font-size: 24px;
  font-style: normal;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  cursor: pointer;
  line-height: 110px;
  border-radius: 50%;
}
</style>
